Sealing cap for the plugs of metallic drums and the like



Dec. 13, 1932. L. a. WACKMAN SEALING CAP FOR THE PLUGS OF METALLIC DRUMSAND THE LIKE Filed Dec. 23. 1929 Fatenteel Dec 13 1832 UNHTEE staresFATENT LOUIS B. WACKMAN, F ST. LGUIS, MISSOURI SEALHTG CAP FOR THE PLUGSOF METALLIC DRUMS AND THE LIKE Application filed December 23, 1929.Serial No. 415,965.

This invention relates to improvements in a sealing cap for the plugs ofmetallic drums and the like and has for its primary object to provide asimple means of obstruction which must be destroyed before the plug canbe removed from the bung hole of the drum.

Another object of the invention is in providing a sealing cap for theclosure plug of a container for obstructing undetectable access to theplug for the removal thereof.

A further object of the invention is in providing a sealing cap which issecured to the closure plug of a container in an improved and simplemanner.

Other and further objects will appear in the specification and bespecifically pointed out in the appended claims, reference being had tothe accompanying drawing, exempli fying the invention, and in whichFigure 1 is a fragmentary view partly in section of a portion of acontainer wall with which the closure plug is cooperable, showing thesealing cap about to be secured over the plug. Figure 2 is a fragmentaryvertical section taken on the line IIII of Fig. 3 through the'closure'plug which is secured in a hung hole bushing and showing thesealing cap mounted in secured positionover the plug. 7 Figure 3 is afragmentary plan view of Fig.

2 partly in section.

Referring by numerals to the accompanying drawing 1 designates a wall ofa metallic container such as is used in oil shipping, and

formed in the wall is a depending neck 2 and disposed concentricallyaround the neck 2 is a countersunk portion 3. A threaded bushing 4 ismounted in the neck 2, said bushing having a flange 5 which is disposedin the countersunk portion 3. The bushing 4 is secured against turningin the neck 2 in a desired manner.

Cooper-able with the bushing for providing a closure for the containeris a threaded plug 6 having a gasket engaging shoulder 7 and acircumferential flange 8 above the shoulder, the flange 8 having adiameter larger than the{;- shoulder 7 and having a beveled ortaperfefdtface 9 on its perimeter.

WVhen the plug65i-s secured in the bushing 4 in making the containerready for shipment with a content in the container, the shoulder 7 ofthe plug will bear against the gasket 10 and in this position of gasketsealing, it will be noted that an annular gap 11 is provided between theinner or under-disposed annular horizontal face 12 of the plug flange 8and the flange 5 of the bushing 4. This is for the purpose hereinafterdescribed with respect to the application of the sealing cap.

After the securing of the plug 6, a one piece sealing cap 13 of a lightweight resilient metal having a depending side wall 14 and aninturnedlip or edge 15 is mounted over the plug and the inturned lip or edge 15will rest upon the annular beveled face 9 approximately as shown in Fig.1 and the top 16 of the cap 13 is then engaged and pressed against theplug and as the annular lip 15 rides down the beveled face 9. the wall14 of the cap will 79 be forced outwardly sufiiciently to permit the lip15 to ride over the outer edge 17 of the beveled face 9 and the annularlip 15 after leaving the beveled face 9 will snap under the inner face12 of the plug flange 8 thus securing the sealing cap to the plug 6. Theannular gap 11 provided between the plug flange 8 and the container Wall1 provides ample room for permitting the inturned annular lip 15 to snapinto place adjacent the inner face 12 of the flange 8.

This manner of securing the sealing cap to the plug may provide a looseengagement therewith which will permit turning of the cap, this beingimmaterial however for it is the purpose of the invention to merelycover the wrench engaging end of the plug in a sealed manner for in theevent of removal of the sealing cap, the engaging inturned edge 15 wouldbe destroyed and if a Stillson wrench or the like were used over thesealing cap without the removal thereof, the mutila' tion of the capwould be clearly discernible.

As aforementioned it is preferable to have the perimeter of the plugflange of a circumferential or circular shape to permit spreadingengagement of the inturned edge 15 of the sealing cap 13 and to provideease of application of the sealing cap to the plug without therequirement of special tools. 1

While the plug shown and described is pro vided with a polygonalcountersunk socket 18 for wrench engagement, it is obvious that myimproved cap is also applicable to plugs 5 having a raised wrenchengaging portion.

It is obvious that various changes may be made in the details ofconstruction without departing from the spirit of this invention, and itis therefore to be understood that this invention is not to be limitedto the specific construction shown and described.

lVhat I claim is 1. A threaded plug for a container having aflanged end,said flange being beveled on its outer perimeter and having a horizontalinner surface, and a cap having a resilient inturned lip at its open endadapted to be forceably engaged over the beveled edge of said plug intounder engagement with the horizontal inner surface of said flange.

2. A container having an opening in one of its walls, a plug for saidopening having a beveled face on its perimeter and an undercuthorizontal annular surface joining said beveled face, and a sealing caphaving a resilient inturned lip at its open end adapted to be forcedover the beveled face of the plug into underengagement with thehorizontal annular surface of said flange.

3. A closure plug for a container having a flanged end. said plug beingthreaded at its opposite end and having a shoulder disposed between theflanged end and the threaded end, the flanged end of said plug beingbeveled on its perimeter and-having an annular horizontal face from theperimeter to the shoulder thereof, wrench engaging means forming a partof the plug disposed inwardly of the perimeter thereof, and a sealingcap having an annular inturned lip adapted to be engaged over the flangeof said plug, said beveled face of said flange providing for thespreading of the annular lip of said cap'as the cap is being forced onsaid plug for underengagement of the lip of the cap with the horizontalface of the flange.

LOUIS B. WACKMAN.

